16540252912665 has 24 divisors (see below), whose sum is σ = 28669990756680. Its totient is φ = 8821400822784.

The previous prime is 16540252912661. The next prime is 16540252912693. The reversal of 16540252912665 is 56621925204561.

16540252912665 is a `hidden beast` number, since 1 + 6 + 5 + 40 + 2 + 529 + 12 + 6 + 65 = 666.

16540252912665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 10285156874304 + 6255096038361 = 3207048^2 + 2501019^2 .

It is not a de Polignac number, because 16540252912665 - 2² = 16540252912661 is a prime.

It is a super-2 number, since 2×16540252912665² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16540252912661) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4858191 + ... + 7528779.

It is an arithmetic number, because the mean of its divisors is an integer number (1194582948195).

Almost surely, 2^{16540252912665} is an apocalyptic number.

16540252912665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16540252912665 is a deficient number, since it is larger than the sum of its proper divisors (12129737844015).

16540252912665 is a wasteful number, since it uses less digits than its factorization.

16540252912665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2808233 (or 2808230 counting only the distinct ones).

The product of its (nonzero) digits is 7776000, while the sum is 54.

The spelling of 16540252912665 in words is "sixteen trillion, five hundred forty billion, two hundred fifty-two million, nine hundred twelve thousand, six hundred sixty-five".